*{ padding:0px; margin:0px;}
a{ text-decoration: none; color:#2C3E50;}
ul ,li{ list-style:none;}
body{ height: 2000px;}
.center{text-align:center; font-size:48px; padding: 30px 0; position: absolute; width:100%; height:100%; top:200px; left:0;}
#top{ overflow: hidden; margin-bottom: 50px;     background: #eee;}
#logo{ float: left; padding: 0 30px;}
#logo img{ width: 60px; height: 60px;}
nav{ width:100%; max-width:800px; margin:10px auto; line-height:40px;}
nav li{ float:left; padding:0 10px;}
.is-active{ background-color: #42B983;}

.slider{ float:left; width:200px; height: 500px;}
